5/8/2013 6:55 AM PDT

Wade Robson is lying through his teeth by now claiming Michael Jackson molested him when he was a child ... so says Howard Weitzman, the lawyer for the MJ Estate.

Weitzman tells TMZ ... "Mr. Robson's claim is outrageous and pathetic. This is a young man who has testified at least twice under oath over the past 20 years and said in numerous interviews that Michael Jackson never did anything inappropriate to him or with him."

Weitzman goes on ... "Now, nearly 4 years after Michael has passed, this sad and less than credible claim has been made."

Sources connected with the case tell TMZ ... Robson is claiming he suffered from "repressed memory" and that's why he didn't file his creditor's claim on time. TMZ broke the story ... Robson filed legal docs against the MJ Estate, claiming Michael molested him when he was a child. Robson was a frequent guest at the Neverland Ranch between the ages of 7 and 14.

Weitzman tells TMZ ... "We are confident that the court will see this for what it is."